Spin wave modes in magnetic nanodisks under in-plane magnetic field

TL;DR

This study systematically investigates how the size of magnetic nanodisks influences spin wave modes under in-plane magnetic fields, revealing frequency shifts and mode transformations with increasing disk diameter.

Contribution

It provides new insights into the size-dependent behavior of spin wave modes in magnetic nanodisks using micromagnetic simulations.

Findings

Resonance frequency of backward mode decreases with disk size.

Resonance frequency of uniform mode increases with disk size.

Avoided crossing occurs between uniform and backward modes.

Abstract

The size dependence of spin wave modes in a circular Permalloy (Py) nanodisk under an in-plane magnetic field is systematically studied by using micromagnetics simulations. We show that as the disk diameter is increased, the resonance frequency of the backward mode deceases while that of the uniform mode increases. The avoided crossing of resonance frequencies of the uniform mode and the backward mode appears in the plot of the size dependence of resonance frequencies and the backward mode turns into the so-called "edge mode" for large nanodisks.